Factors for Evaluating the Need for Bridge Barrier Systems

Consider the following factors when evaluating the need for any component of a bridge barrier system. (The factors are not in any particular order.)

A. Accident history at the site.

B. Vehicle speeds approaching and across the bridge.

C. Average daily traffic and average daily truck traffic.

D. One-way versus two-way traffic.

E. Bridge surface (i.e. slippery vs. non-slippery).

F. Approach roadway alignment.

G. Approach roadway width vs. bridge width.

H. Approach roadway surface.

I. Approach sight distance and sight distance across the bridge.

J. Approach roadway embankment slope.

K. Bridge geometry including width, length, and deck cross-section (flat vs. crown).

L. Typical weather conditions such as snow and ice, frequent fog, rain, and runoff.

M. Nighttime use.

N. Familiarity of users with the bridge.

O. Bridge height over waterway (or other feature crossed).

P. Depth of water below bridge.

Q. Operational concerns of the facility.

R. Aesthetic concerns.

S. Pedestrian use.

T. Projected future use of the bridge.